Try improving the algorithm to calculate the difference so it is written in less lines of code.
This is a companion discussion topic for the original entry at https://www.raywenderlich.com/3990-your-first-swift-4-ios-11-app/lessons/23
This is a companion discussion topic for the original entry at https://www.raywenderlich.com/3990-your-first-swift-4-ios-11-app/lessons/23
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